/**
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements.  See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership.  The ASF licenses this file to you under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with the License.  You may obtain
 * a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

package org.apache.jute;

import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;

/**
 * Front-end interface to deserializers. Also acts as a factory
 * for deserializers.
 *
 */
public class RecordReader {

    static private HashMap archiveFactory;

    static {
        archiveFactory = new HashMap();
        Class[] params = {InputStream.class};
        try {
            archiveFactory.put("binary",
                               BinaryInputArchive.class.getDeclaredMethod(
                                       "getArchive", params));
            archiveFactory.put("csv",
                               CsvInputArchive.class.getDeclaredMethod(
                                       "getArchive", params));
            archiveFactory.put("xml",
                               XmlInputArchive.class.getDeclaredMethod(
                                       "getArchive", params));
        } catch (SecurityException ex) {
            ex.printStackTrace();
        } catch (NoSuchMethodException ex) {
            ex.printStackTrace();
        }
    }

    private InputArchive archive;

    /**
     * Creates a new instance of RecordReader.
     * @param in Stream from which to deserialize a record
     * @param format Deserialization format ("binary", "xml", or "csv")
     */
    public RecordReader(InputStream in, String format) throws IOException {
        archive = createArchive(in, format);
    }

    static private InputArchive createArchive(InputStream in, String format) throws IOException {
        Method factory = (Method) archiveFactory.get(format);
        if (factory != null) {
            Object[] params = {in};
            try {
                return (InputArchive) factory.invoke(null, params);
            } catch (IllegalArgumentException ex) {
                ex.printStackTrace();
            } catch (InvocationTargetException ex) {
                ex.printStackTrace();
            } catch (IllegalAccessException ex) {
                ex.printStackTrace();
            }
        }
        return null;
    }

    /**
     * Deserialize a record
     * @param r Record to be deserialized
     */
    public void read(Record r) throws IOException {
        r.deserialize(archive, "");
    }

}
